Skip to main content

Table 5 Socio economic status and lifestyle of the study subjects

From: Chronic exposure to emissions from photocopiers in copy shops causes oxidative stress and systematic inflammation among photocopier operators in India

Demographics Control Photocopier workers p value
N 43 81  
Male (%) 30 (70) 64 (79) 0.253*
Age Mean (S.D) 31.7 (7.4) 32.6 (7.1) 0.467**
Monthly income(Rs)    
≤3000 1 (2) 2 (3) 0.047†
3001–10000 27 (63) 61 (75)
10000–20000 5 (12) 13 (16)
>20000 10 (23) 5 (6)
BMI Mean (S.D) 24.2 (4.0) 24.9 (6.2) 0.513**
Current smokers (%) 8 (19) 30 (37) 0.041*
Pack years Mean (S.D) 2.0 (1.8) 2.9 (4.6) 0.510**
Cumulative exposure (1000 s of hours)    
10 – 20   13  
21 – 30   30  
31–40   13  
41 – 70   15  
Alcohol use 11 (26) 30 (37) 0.232
  1. * - Chi square test; ** - Students t test; † − Fisher’s exact test.
  2. BMI Body mass index; Pack years = (Average number of cigarettes per day/20) × number of years smoked.
  3. Cumulative exposure = No. of working hours/day × No. of working days/week × No. of years of exposure × 50 weeks/year.